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Durability Assessment Method of Hollow Thin-Walled Bridge Piers under Rockfall Impact Based on Damage Response Surface

Author

Listed:
  • Fei Li

    (College of Civil Engineering, Longdong University, Qingyang 745000, China
    Provincial Key Laboratory of Engineering Properties and Applications of Loess in Colleges and Universities of Gansu Province, Qingyang 745000, China)

  • Yikang Liu

    (School of Civil Engineering, Central South University, Changsha 410075, China)

  • Jian Yang

    (School of Civil Engineering, Central South University, Changsha 410075, China)

Abstract

Continuous rigid-frame bridges across valleys are often at risk of rockfalls caused by heavy rainfalls, earthquakes, and debris flow in a mountainous environment. Hollow thin-walled bridge piers (HTWBP) in valleys are exposed to the threat of impact from accidental rockfalls. In the current research, ANSYS/LS-DYNA is used to establish a high-precision rockfall-HTWBP model. The rockfall-HTWBP model is verified against a scaled impact test performed in previously published research. A mesh independence test is also performed to obtain an appropriate mesh size. Based on the rockfall-HTWBP model, the impact force, damage, and dynamic response characteristics of HTWBP under a rockfall impact are studied. In addition, a damage assessment criterion is proposed, based on the response surface model, combined with the central composite design method and Box–Behnken design method. The main conclusions are as follows: (1) the impact force of the rockfall has a substantial impulse characteristic, and the duration of the impulse load is approximately 0.01 s. (2) The impacted surface of the pier is dominated by the final elliptic damage, with conical and strip damage areas as the symmetry axis. The cross-sectional damage mode is from compression failure in the impact area and shear failure at the corner. (3) The maximum displacement occurs in the middle height of the pier. The maximum displacement increases with impact height, impact velocity, and rockfall diameter and decreases with the uniaxial compressive strength of the concrete. (4) The initial impact velocity and diameter of the rockfall are the most significant parameters affecting the damage indices. In addition, a damage assessment method, with a damage zoning diagram based on the response surface method, is established for the fast assessment of the damage level of impacted HTWBP.

Suggested Citation

  • Fei Li & Yikang Liu & Jian Yang, 2022. "Durability Assessment Method of Hollow Thin-Walled Bridge Piers under Rockfall Impact Based on Damage Response Surface," Sustainability, MDPI, vol. 14(19), pages 1-24, September.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:19:p:12196-:d:925697
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    References listed on IDEAS

    as
    1. You Wang & Shaohua Liang & Changxi Huang & Rui Wang, 2022. "Foundation Settlement Response of Existing High-Speed Railway Bridge Induced by Construction of Undercrossing Roads," Sustainability, MDPI, vol. 14(14), pages 1-19, July.
    2. Peizhen Li & Tangzhenhao Li & Zheng Lu & Jin Li, 2017. "Study on Dynamic Response of Novel Masonry Structures Impacted by Debris Flow," Sustainability, MDPI, vol. 9(7), pages 1-22, June.
    3. Jian Meng & Ziling Xu & Zeli Liu & Song Chen & Chen Wang & Ben Zhao & An Zhou, 2022. "Experimental Study on the Mechanics and Impact Resistance of Multiphase Lightweight Aggregate Concrete," Sustainability, MDPI, vol. 14(15), pages 1-15, August.
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